Chapter 4.5

4.5.1 Theorem A diagonal of a parallelogram divides the parallelogram into two congruent triangles.

4.5.2 Theorem The opposite sides of a parallelogram are congruent.

4.5.3 Theorem The opposite angles of a parallelogram are congruent.

4.5.4 Theorem Consecutive angles of a parallelogram are supplementary.

4.5.5 Theorem The diagonals of a parallelogram bisect eachother.

4.5.6 Theorem A rhombus is a parallelogram.

4.5.7 Theorem A rectangle is a parallelogram.

4.5.8 Theorem The diagonals of a rhombus are perpindicular.

4.5.9 Theorem The diagonals of a rectangle are congruent.
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4.5.10 Theorem The diagonals of a kite are perpindicular.

4.5.11 Theorem A square is a rectangle.

4.5.12 Theorem A square is a rhombus.

4.5.13 Theorem The diagonals of a square are congruent and are the perpindicular bisectors of eachother.